Bump meta from 1.18.1 to 1.18.2

[dependabot]

Bumps meta from 1.18.1 to 1.18.2.

Changelog

Sourced from meta's changelog.

3.12.0

Released on: Unreleased

Language

Private named parameters

Dart now supports private named parameters. Before 3.12, it was an error to have a named parameter that starts with an underscore:

class Point {
  final int _x, _y;
  // Compile error in Dart 3.11.
  Point({required this._x, required this._y});
}

That means that when you wanted to initialize a private field from a named parameter, you had to write an explicit initializer list:

class Point {
  final int _x, _y;
  Point({required int x, required int y})
    : x = _x,
      y = _y;
}

All the initializer list is doing is scraping off the _. In Dart 3.12, the language will do that for you. Now you can write:

class Point {
  final int _x, _y; // Private fields.
  Point({required this._x, required this._y});
}

It behaves exactly like the previous example. The initialized fields are private, but the argument names written at the call site are public:

main() {
  print(Point(x: 1, y: 2));
}
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